			15min:

THE ULTRA VIOLET SPECTRUM OF TeO₂.

DANIEL F HULLAH AND JOHN M BROWN, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, UK.

The laser induced fluorescence spectrum of TeO₂ has been recorded between 345 nm and 405, using a high temperature nozzle source. The spectrum shows a considerable improvement in signal-to-noise ratio in comparison with that of Dubois¹ and this has lead to a reassignment of the vibrational structure, including the band origin.

To date, 58 vibrational bands (27 cold and 31 hot) have been reassigned to the ¹B₂-¹A₁ electronic transition of TeO₂. The values of the band origin and the vibrational frequencies for the symmetric stretch (\omega₁) and bending (\omega₂) modes are given as follows (values are in cm^-1)

TABLE

Measurements at high resolution are planned to allow a rotational analysis. Following on from this work, the products of the high temperature reaction Te + H₂O are to be investigated.

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Reference

1. I. Dubois, Bulletin de la Societé Royale de Liege, 39^e année, n^o 1-2, 63 (1970)